@import "libary.less";
#app {
  width: 500px;
  height: 500px;
  background-color: red;
  margin: 10px auto;
  border: 1px solid black;
}
#app h1 {
  color: #ffffff;
}
#app .bordered {
  border: 1px solid black;
}
#app .logo {
  width: 100px;
  border: 1px solid black;
  background-color: white;
  border-radius: 50%;
  padding: 3px;
}
#app::after {
  display: block;
  content: 'hello,world';
  width: 100px;
  height: 100px;
  border: 1px solid black;
}
.box {
  width: calc(50% + (25vh - 20px));
  height: 100px;
  border: 1px solid black;
}
